Green azo dye.



. B.) are a 'diazotized with German lampire, resid 5 near Cologne,

molecule of ,an and with one molecule of an azo d acid. a The tetrazo compound with a solution of 14.2 parts of salicylic acid WILHELM BEBGDOLT,

FAIR-IBENFABRIKEN VORM. FRIEDB. BAYER" & (10.,

conroaa'rlon or GERMANY.

OF LEVERKUSEN, NE AR' CbLOGNE,

GEBMANY,-"ASSIGNOB T0 or ELBEBFELD, ennmmr, a

GREEN- azo mm.

Ro Drawing.

Toall whom it' may concern:

Be it known that I, WILHnLM'BEncnoL'r,

doctor of I hilosophy, chemist, citizen of the ing at Leverkusen, Germany, have invented a New Dye, of which the following is a specification.

:My invention relates to the manufacture.

and roduction of new green azo dyestuffs whic can be obtained by combining the tetrazo compounds of a para-diamin with one ortho oxy carboxylic acid estuif obtained fromdiazotized anilin disu fonic acid and an 1.8 aminonaphthol sulfonic acid.

The dyes thus obtained are in the shape of their alkaline salts dark powders soluble in water generally with a green color; upon reduction with stannous chlorid and hydrochloric acid they are decomposed, a paradiamin, an amino-ortho-oxy-carboxylic acid, an anilin disulfonic acid and a triamino-8- oxynaphthalene sulfonic acid being obtained. They are valuable green substantive dyestuffs, which possess an extraordinary pureness of shade. '.'T hey are especially suitable for dyeing half-wool.

In order to illustrate the new process more fully the following example is given, the parts being by weight :-21.3 parts of tolidin are tetrazotizedwith a solution of 14 parts of sodium nitrite and hydrochloric is combined containing an excess of sodium carbonate. Subse uently 414.75 parts of anilin disulfonate di sodium (1 :2: 5) are dissolved in hot water, arts of hydrochloric acid (195 ed thereto and the amin is then a solution of 6.9 parts of sodium nitrite. To the diazov compoun thus produced a neutral solution 0 parts of 1.8-aminonaphtholi-sulfonic acid is added. The mixture is stirred for several hours. The formation of the dye is then complete. 15 parts of sodium carbonate are added to the mixture to obtain a solution and then the intermediate product of tetrazotized tolidin and 'salicylic acid is added. After some hours the dye is salted out, filtered ofi and dried. 'It'is after being dried e of its sodium salt a dark powder soluble in hot water with Specification of Letters Patent.

Patented Nov. 1, 1910.

Application iilediebruary 12, 1910. Serial No. 543,490.

a green color and soluble in concentrated sulfuric acid with a bluish-violet color' upon reduction with stannous chlorid an hydrochloric acid the dye is split up into tolidin aminosalicylic acid, triamino-8- naphthol- L-sulfonic acid and anilin disulfonic acid (1:215). It dyes half-wool pure green shades.

The process is carried out in an analogous manner on using other of the above mentioned components, 6. g. instead of tolidin, benzidin or dianisidin, instead of salicylic acid cresotinic acid or chloro-salicylic acid and other aminonaphthol sulfonic acids, such as 1 .8.3.6- or 1.8.4.6-aminonaphthol disulfonic acid.

I claim 1. The hereinalescribed new azo dyestuffs obtainable from a para-diannn, an orthohc acid, an LS-annnonaphthol I oxy-carboxy sulfonic acid and an anilin disnlfonic acid, which dyestuffs are, afterbeing dried and pulverized, in the shape of their alkaline salts dark powders soluble in hot water generally with a green color; yielding upon reduction with stannous chlorid and hydrochloric acid a para-diamin, an amino-orthooxy -carboxylic acid, an anilin-disulfonic acid and a triamino 8 na hthol sulfonic acid; and dyein half-woo green shades, substantially as escribed.

2. The herein-described new azo dyestufi obtainable from tolidin, salicylic acid, 1.8- aminonaphthol-lsulfonic acid and 1.2.5- anilin-disulfonic acid, which dyestufi' is, after being dried and pulverized, in the shape of its sodium salt a dark owder soluble in hot water with a green co or and soluble in concentrated sulfuric acid with a bluish-violet color, yieldin upon reduction with stannous chlorid an hydrochloric acid tolidin, aminosalicylic acid, 1.2.5 anilin disulfonic acid and triamino- 8- naphthol-isulfonic acid and dyeing half-wool green shades, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILHELM BERGDOLT. [1a 5.] Witnesses:

O'rro Konm,

CHAS. J. WRIG 

